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AN1500A
sames
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16.1
16.2
16.3
16.4
16.5
16.6
16.7
16.8
ELECTRICAL REQUIREMENTS
.......................................................................................................................... 17
S
INGLE BIPOLAR TRANSISTOR
........................................................................................................................ 17
B
IPOLAR DARLINGTON TRANSISTOR
............................................................................................................... 18
VMOS-FET
WITH SURGE PROTECTION
.......................................................................................................... 18
VMOS-FET
WITH OVERCURRENT PROTECTION
.............................................................................................. 18
C
URRENT
L
IMITING
........................................................................................................................................ 19
O
VERVOLTAGE PROTECTION OF THE
PCB:..................................................................................................... 19
DC-
MASK FOR VARIOUS HOOK TRANSISTOR ARRANGEMENTS
.......................................................................... 20
SHUNT- AND RINGER TRANSISTORS ..................................................................................................... 20
ON-HOOK CONDITIONS .............................................................................................................................. 20
18.1
Q
UIESCENT CURRENT PATH
........................................................................................................................... 21
RINGING MODE ............................................................................................................................................ 21
19.1
R
INGING FREQUENCY COMPARATOR
.............................................................................................................. 21
OSCILLATOR INPUT .................................................................................................................................... 21
EMC & RFI ISSUES....................................................................................................................................... 21
21.1
T
ECHNOLOGY
:.............................................................................................................................................. 21
21.2
L
AYOUT HINTS
: ............................................................................................................................................. 21
21.3
EMC
BLOCKING PARTS
: ................................................................................................................................ 22
21.4
B
LOCKING OF
AGND: ................................................................................................................................... 22
BOARD SCHEMATIC.................................................................................................................................... 23
BOARD LAYOUT........................................................................................................................................... 24
PART LIST..................................................................................................................................................... 25
APPLICATIONS............................................................................................................................................. 26
LIABILITY AND COPYRIGHT STATEMENT................................................................................................ 27
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